<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app">
        <Fruitlist></Fruitlist>
    </div>

    <script src="https://unpkg.com/vue@next"></script>
    <script>
        const app = Vue.createApp({
            data(){
                return {
                    
                }
            }
        });

        app.component("Fruitlist",{
            data(){
                return {
                    list:["香蕉","苹果"]
                }
            },
            
            template:`
            <ul>
                <li v-for="item in list">
                    {{item}}
                    <counter></counter>    
                </li>
                
            </ul>
            
            `
        });

        app.component("counter",{
            data(){
                return {
                    number:0,
                }
            },
            methods:{
                increase(){
                    this.number ++;
                },
                decrease(){
                    if(this.number>0){
                        this.number --;
                    }
                }
            },
            template:`
            <button @click="decrease">-</button>
            <span>{{number}}</span>
            <button @click="increase">+</button>
            `
        });

        app.mount("#app");



    </script>
</body>
</html>